diff options
Diffstat (limited to 'net/ipv6/mcast.c')
| -rw-r--r-- | net/ipv6/mcast.c | 3018 |
1 files changed, 3018 insertions, 0 deletions
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c new file mode 100644 index 000000000..9fb5077f8 --- /dev/null +++ b/net/ipv6/mcast.c @@ -0,0 +1,3018 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Multicast support for IPv6 + * Linux INET6 implementation + * + * Authors: + * Pedro Roque <roque@di.fc.ul.pt> + * + * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c + */ + +/* Changes: + * + * yoshfuji : fix format of router-alert option + * YOSHIFUJI Hideaki @USAGI: + * Fixed source address for MLD message based on + * <draft-ietf-magma-mld-source-05.txt>. + * YOSHIFUJI Hideaki @USAGI: + * - Ignore Queries for invalid addresses. + * - MLD for link-local addresses. + * David L Stevens <dlstevens@us.ibm.com>: + * - MLDv2 support + */ + +#include <linux/module.h> +#include <linux/errno.h> +#include <linux/types.h> +#include <linux/string.h> +#include <linux/socket.h> +#include <linux/sockios.h> +#include <linux/jiffies.h> +#include <linux/times.h> +#include <linux/net.h> +#include <linux/in.h> +#include <linux/in6.h> +#include <linux/netdevice.h> +#include <linux/if_arp.h> +#include <linux/route.h> +#include <linux/init.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> +#include <linux/slab.h> +#include <linux/pkt_sched.h> +#include <net/mld.h> + +#include <linux/netfilter.h> +#include <linux/netfilter_ipv6.h> + +#include <net/net_namespace.h> +#include <net/sock.h> +#include <net/snmp.h> + +#include <net/ipv6.h> +#include <net/protocol.h> +#include <net/if_inet6.h> +#include <net/ndisc.h> +#include <net/addrconf.h> +#include <net/ip6_route.h> +#include <net/inet_common.h> + +#include <net/ip6_checksum.h> + +/* Ensure that we have struct in6_addr aligned on 32bit word. */ +static int __mld2_query_bugs[] __attribute__((__unused__)) = { + BUILD_BUG_ON_ZERO(offsetof(struct mld2_query, mld2q_srcs) % 4), + BUILD_BUG_ON_ZERO(offsetof(struct mld2_report, mld2r_grec) % 4), + BUILD_BUG_ON_ZERO(offsetof(struct mld2_grec, grec_mca) % 4) +}; + +static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT; + +static void igmp6_join_group(struct ifmcaddr6 *ma); +static void igmp6_leave_group(struct ifmcaddr6 *ma); +static void igmp6_timer_handler(struct timer_list *t); + +static void mld_gq_timer_expire(struct timer_list *t); +static void mld_ifc_timer_expire(struct timer_list *t); +static void mld_ifc_event(struct inet6_dev *idev); +static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc); +static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc); +static void mld_clear_delrec(struct inet6_dev *idev); +static bool mld_in_v1_mode(const struct inet6_dev *idev); +static int sf_setstate(struct ifmcaddr6 *pmc); +static void sf_markstate(struct ifmcaddr6 *pmc); +static void ip6_mc_clear_src(struct ifmcaddr6 *pmc); +static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, + int sfmode, int sfcount, const struct in6_addr *psfsrc, + int delta); +static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, + int sfmode, int sfcount, const struct in6_addr *psfsrc, + int delta); +static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, + struct inet6_dev *idev); +static int __ipv6_dev_mc_inc(struct net_device *dev, + const struct in6_addr *addr, unsigned int mode); + +#define MLD_QRV_DEFAULT 2 +/* RFC3810, 9.2. Query Interval */ +#define MLD_QI_DEFAULT (125 * HZ) +/* RFC3810, 9.3. Query Response Interval */ +#define MLD_QRI_DEFAULT (10 * HZ) + +/* RFC3810, 8.1 Query Version Distinctions */ +#define MLD_V1_QUERY_LEN 24 +#define MLD_V2_QUERY_LEN_MIN 28 + +#define IPV6_MLD_MAX_MSF 64 + +int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF; +int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT; + +/* + * socket join on multicast group + */ + +#define for_each_pmc_rcu(np, pmc) \ + for (pmc = rcu_dereference(np->ipv6_mc_list); \ + pmc != NULL; \ + pmc = rcu_dereference(pmc->next)) + +static int unsolicited_report_interval(struct inet6_dev *idev) +{ + int iv; + + if (mld_in_v1_mode(idev)) + iv = idev->cnf.mldv1_unsolicited_report_interval; + else + iv = idev->cnf.mldv2_unsolicited_report_interval; + + return iv > 0 ? iv : 1; +} + +static int __ipv6_sock_mc_join(struct sock *sk, int ifindex, + const struct in6_addr *addr, unsigned int mode) +{ + struct net_device *dev = NULL; + struct ipv6_mc_socklist *mc_lst; + struct ipv6_pinfo *np = inet6_sk(sk); + struct net *net = sock_net(sk); + int err; + + ASSERT_RTNL(); + + if (!ipv6_addr_is_multicast(addr)) + return -EINVAL; + + rcu_read_lock(); + for_each_pmc_rcu(np, mc_lst) { + if ((ifindex == 0 || mc_lst->ifindex == ifindex) && + ipv6_addr_equal(&mc_lst->addr, addr)) { + rcu_read_unlock(); + return -EADDRINUSE; + } + } + rcu_read_unlock(); + + mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL); + + if (!mc_lst) + return -ENOMEM; + + mc_lst->next = NULL; + mc_lst->addr = *addr; + + if (ifindex == 0) { + struct rt6_info *rt; + rt = rt6_lookup(net, addr, NULL, 0, NULL, 0); + if (rt) { + dev = rt->dst.dev; + ip6_rt_put(rt); + } + } else + dev = __dev_get_by_index(net, ifindex); + + if (!dev) { + sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); + return -ENODEV; + } + + mc_lst->ifindex = dev->ifindex; + mc_lst->sfmode = mode; + rwlock_init(&mc_lst->sflock); + mc_lst->sflist = NULL; + + /* + * now add/increase the group membership on the device + */ + + err = __ipv6_dev_mc_inc(dev, addr, mode); + + if (err) { + sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); + return err; + } + + mc_lst->next = np->ipv6_mc_list; + rcu_assign_pointer(np->ipv6_mc_list, mc_lst); + + return 0; +} + +int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr) +{ + return __ipv6_sock_mc_join(sk, ifindex, addr, MCAST_EXCLUDE); +} +EXPORT_SYMBOL(ipv6_sock_mc_join); + +int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex, + const struct in6_addr *addr, unsigned int mode) +{ + return __ipv6_sock_mc_join(sk, ifindex, addr, mode); +} + +/* + * socket leave on multicast group + */ +int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) +{ + struct ipv6_pinfo *np = inet6_sk(sk); + struct ipv6_mc_socklist *mc_lst; + struct ipv6_mc_socklist __rcu **lnk; + struct net *net = sock_net(sk); + + ASSERT_RTNL(); + + if (!ipv6_addr_is_multicast(addr)) + return -EINVAL; + + for (lnk = &np->ipv6_mc_list; + (mc_lst = rtnl_dereference(*lnk)) != NULL; + lnk = &mc_lst->next) { + if ((ifindex == 0 || mc_lst->ifindex == ifindex) && + ipv6_addr_equal(&mc_lst->addr, addr)) { + struct net_device *dev; + + *lnk = mc_lst->next; + + dev = __dev_get_by_index(net, mc_lst->ifindex); + if (dev) { + struct inet6_dev *idev = __in6_dev_get(dev); + + (void) ip6_mc_leave_src(sk, mc_lst, idev); + if (idev) + __ipv6_dev_mc_dec(idev, &mc_lst->addr); + } else + (void) ip6_mc_leave_src(sk, mc_lst, NULL); + + atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); + kfree_rcu(mc_lst, rcu); + return 0; + } + } + + return -EADDRNOTAVAIL; +} +EXPORT_SYMBOL(ipv6_sock_mc_drop); + +/* called with rcu_read_lock() */ +static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net, + const struct in6_addr *group, + int ifindex) +{ + struct net_device *dev = NULL; + struct inet6_dev *idev = NULL; + + if (ifindex == 0) { + struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, NULL, 0); + + if (rt) { + dev = rt->dst.dev; + ip6_rt_put(rt); + } + } else + dev = dev_get_by_index_rcu(net, ifindex); + + if (!dev) + return NULL; + idev = __in6_dev_get(dev); + if (!idev) + return NULL; + read_lock_bh(&idev->lock); + if (idev->dead) { + read_unlock_bh(&idev->lock); + return NULL; + } + return idev; +} + +void __ipv6_sock_mc_close(struct sock *sk) +{ + struct ipv6_pinfo *np = inet6_sk(sk); + struct ipv6_mc_socklist *mc_lst; + struct net *net = sock_net(sk); + + ASSERT_RTNL(); + + while ((mc_lst = rtnl_dereference(np->ipv6_mc_list)) != NULL) { + struct net_device *dev; + + np->ipv6_mc_list = mc_lst->next; + + dev = __dev_get_by_index(net, mc_lst->ifindex); + if (dev) { + struct inet6_dev *idev = __in6_dev_get(dev); + + (void) ip6_mc_leave_src(sk, mc_lst, idev); + if (idev) + __ipv6_dev_mc_dec(idev, &mc_lst->addr); + } else + (void) ip6_mc_leave_src(sk, mc_lst, NULL); + + atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); + kfree_rcu(mc_lst, rcu); + } +} + +void ipv6_sock_mc_close(struct sock *sk) +{ + struct ipv6_pinfo *np = inet6_sk(sk); + + if (!rcu_access_pointer(np->ipv6_mc_list)) + return; + rtnl_lock(); + __ipv6_sock_mc_close(sk); + rtnl_unlock(); +} + +int ip6_mc_source(int add, int omode, struct sock *sk, + struct group_source_req *pgsr) +{ + struct in6_addr *source, *group; + struct ipv6_mc_socklist *pmc; + struct inet6_dev *idev; + struct ipv6_pinfo *inet6 = inet6_sk(sk); + struct ip6_sf_socklist *psl; + struct net *net = sock_net(sk); + int i, j, rv; + int leavegroup = 0; + int pmclocked = 0; + int err; + + source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; + group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; + + if (!ipv6_addr_is_multicast(group)) + return -EINVAL; + + rcu_read_lock(); + idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface); + if (!idev) { + rcu_read_unlock(); + return -ENODEV; + } + + err = -EADDRNOTAVAIL; + + for_each_pmc_rcu(inet6, pmc) { + if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) + continue; + if (ipv6_addr_equal(&pmc->addr, group)) + break; + } + if (!pmc) { /* must have a prior join */ + err = -EINVAL; + goto done; + } + /* if a source filter was set, must be the same mode as before */ + if (pmc->sflist) { + if (pmc->sfmode != omode) { + err = -EINVAL; + goto done; + } + } else if (pmc->sfmode != omode) { + /* allow mode switches for empty-set filters */ + ip6_mc_add_src(idev, group, omode, 0, NULL, 0); + ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); + pmc->sfmode = omode; + } + + write_lock(&pmc->sflock); + pmclocked = 1; + + psl = pmc->sflist; + if (!add) { + if (!psl) + goto done; /* err = -EADDRNOTAVAIL */ + rv = !0; + for (i = 0; i < psl->sl_count; i++) { + rv = !ipv6_addr_equal(&psl->sl_addr[i], source); + if (rv == 0) + break; + } + if (rv) /* source not found */ + goto done; /* err = -EADDRNOTAVAIL */ + + /* special case - (INCLUDE, empty) == LEAVE_GROUP */ + if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { + leavegroup = 1; + goto done; + } + + /* update the interface filter */ + ip6_mc_del_src(idev, group, omode, 1, source, 1); + + for (j = i+1; j < psl->sl_count; j++) + psl->sl_addr[j-1] = psl->sl_addr[j]; + psl->sl_count--; + err = 0; + goto done; + } + /* else, add a new source to the filter */ + + if (psl && psl->sl_count >= sysctl_mld_max_msf) { + err = -ENOBUFS; + goto done; + } + if (!psl || psl->sl_count == psl->sl_max) { + struct ip6_sf_socklist *newpsl; + int count = IP6_SFBLOCK; + + if (psl) + count += psl->sl_max; + newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC); + if (!newpsl) { + err = -ENOBUFS; + goto done; + } + newpsl->sl_max = count; + newpsl->sl_count = count - IP6_SFBLOCK; + if (psl) { + for (i = 0; i < psl->sl_count; i++) + newpsl->sl_addr[i] = psl->sl_addr[i]; + sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); + } + pmc->sflist = psl = newpsl; + } + rv = 1; /* > 0 for insert logic below if sl_count is 0 */ + for (i = 0; i < psl->sl_count; i++) { + rv = !ipv6_addr_equal(&psl->sl_addr[i], source); + if (rv == 0) /* There is an error in the address. */ + goto done; + } + for (j = psl->sl_count-1; j >= i; j--) + psl->sl_addr[j+1] = psl->sl_addr[j]; + psl->sl_addr[i] = *source; + psl->sl_count++; + err = 0; + /* update the interface list */ + ip6_mc_add_src(idev, group, omode, 1, source, 1); +done: + if (pmclocked) + write_unlock(&pmc->sflock); + read_unlock_bh(&idev->lock); + rcu_read_unlock(); + if (leavegroup) + err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); + return err; +} + +int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf, + struct sockaddr_storage *list) +{ + const struct in6_addr *group; + struct ipv6_mc_socklist *pmc; + struct inet6_dev *idev; + struct ipv6_pinfo *inet6 = inet6_sk(sk); + struct ip6_sf_socklist *newpsl, *psl; + struct net *net = sock_net(sk); + int leavegroup = 0; + int i, err; + + group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; + + if (!ipv6_addr_is_multicast(group)) + return -EINVAL; + if (gsf->gf_fmode != MCAST_INCLUDE && + gsf->gf_fmode != MCAST_EXCLUDE) + return -EINVAL; + + rcu_read_lock(); + idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); + + if (!idev) { + rcu_read_unlock(); + return -ENODEV; + } + + err = 0; + + if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { + leavegroup = 1; + goto done; + } + + for_each_pmc_rcu(inet6, pmc) { + if (pmc->ifindex != gsf->gf_interface) + continue; + if (ipv6_addr_equal(&pmc->addr, group)) + break; + } + if (!pmc) { /* must have a prior join */ + err = -EINVAL; + goto done; + } + if (gsf->gf_numsrc) { + newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc), + GFP_ATOMIC); + if (!newpsl) { + err = -ENOBUFS; + goto done; + } + newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; + for (i = 0; i < newpsl->sl_count; ++i, ++list) { + struct sockaddr_in6 *psin6; + + psin6 = (struct sockaddr_in6 *)list; + newpsl->sl_addr[i] = psin6->sin6_addr; + } + err = ip6_mc_add_src(idev, group, gsf->gf_fmode, + newpsl->sl_count, newpsl->sl_addr, 0); + if (err) { + sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); + goto done; + } + } else { + newpsl = NULL; + (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); + } + + write_lock(&pmc->sflock); + psl = pmc->sflist; + if (psl) { + (void) ip6_mc_del_src(idev, group, pmc->sfmode, + psl->sl_count, psl->sl_addr, 0); + sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); + } else + (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); + pmc->sflist = newpsl; + pmc->sfmode = gsf->gf_fmode; + write_unlock(&pmc->sflock); + err = 0; +done: + read_unlock_bh(&idev->lock); + rcu_read_unlock(); + if (leavegroup) + err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); + return err; +} + +int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, + struct sockaddr_storage *p) +{ + int err, i, count, copycount; + const struct in6_addr *group; + struct ipv6_mc_socklist *pmc; + struct inet6_dev *idev; + struct ipv6_pinfo *inet6 = inet6_sk(sk); + struct ip6_sf_socklist *psl; + struct net *net = sock_net(sk); + + group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; + + if (!ipv6_addr_is_multicast(group)) + return -EINVAL; + + rcu_read_lock(); + idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); + + if (!idev) { + rcu_read_unlock(); + return -ENODEV; + } + + err = -EADDRNOTAVAIL; + /* changes to the ipv6_mc_list require the socket lock and + * rtnl lock. We have the socket lock and rcu read lock, + * so reading the list is safe. + */ + + for_each_pmc_rcu(inet6, pmc) { + if (pmc->ifindex != gsf->gf_interface) + continue; + if (ipv6_addr_equal(group, &pmc->addr)) + break; + } + if (!pmc) /* must have a prior join */ + goto done; + gsf->gf_fmode = pmc->sfmode; + psl = pmc->sflist; + count = psl ? psl->sl_count : 0; + read_unlock_bh(&idev->lock); + rcu_read_unlock(); + + copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; + gsf->gf_numsrc = count; + /* changes to psl require the socket lock, and a write lock + * on pmc->sflock. We have the socket lock so reading here is safe. + */ + for (i = 0; i < copycount; i++, p++) { + struct sockaddr_in6 *psin6; + struct sockaddr_storage ss; + + psin6 = (struct sockaddr_in6 *)&ss; + memset(&ss, 0, sizeof(ss)); + psin6->sin6_family = AF_INET6; + psin6->sin6_addr = psl->sl_addr[i]; + if (copy_to_user(p, &ss, sizeof(ss))) + return -EFAULT; + } + return 0; +done: + read_unlock_bh(&idev->lock); + rcu_read_unlock(); + return err; +} + +bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, + const struct in6_addr *src_addr) +{ + struct ipv6_pinfo *np = inet6_sk(sk); + struct ipv6_mc_socklist *mc; + struct ip6_sf_socklist *psl; + bool rv = true; + + rcu_read_lock(); + for_each_pmc_rcu(np, mc) { + if (ipv6_addr_equal(&mc->addr, mc_addr)) + break; + } + if (!mc) { + rcu_read_unlock(); + return np->mc_all; + } + read_lock(&mc->sflock); + psl = mc->sflist; + if (!psl) { + rv = mc->sfmode == MCAST_EXCLUDE; + } else { + int i; + + for (i = 0; i < psl->sl_count; i++) { + if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) + break; + } + if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) + rv = false; + if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) + rv = false; + } + read_unlock(&mc->sflock); + rcu_read_unlock(); + + return rv; +} + +static void igmp6_group_added(struct ifmcaddr6 *mc) +{ + struct net_device *dev = mc->idev->dev; + char buf[MAX_ADDR_LEN]; + + if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < + IPV6_ADDR_SCOPE_LINKLOCAL) + return; + + spin_lock_bh(&mc->mca_lock); + if (!(mc->mca_flags&MAF_LOADED)) { + mc->mca_flags |= MAF_LOADED; + if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) + dev_mc_add(dev, buf); + } + spin_unlock_bh(&mc->mca_lock); + + if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) + return; + + if (mld_in_v1_mode(mc->idev)) { + igmp6_join_group(mc); + return; + } + /* else v2 */ + + /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we + * should not send filter-mode change record as the mode + * should be from IN() to IN(A). + */ + if (mc->mca_sfmode == MCAST_EXCLUDE) + mc->mca_crcount = mc->idev->mc_qrv; + + mld_ifc_event(mc->idev); +} + +static void igmp6_group_dropped(struct ifmcaddr6 *mc) +{ + struct net_device *dev = mc->idev->dev; + char buf[MAX_ADDR_LEN]; + + if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < + IPV6_ADDR_SCOPE_LINKLOCAL) + return; + + spin_lock_bh(&mc->mca_lock); + if (mc->mca_flags&MAF_LOADED) { + mc->mca_flags &= ~MAF_LOADED; + if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) + dev_mc_del(dev, buf); + } + + spin_unlock_bh(&mc->mca_lock); + if (mc->mca_flags & MAF_NOREPORT) + return; + + if (!mc->idev->dead) + igmp6_leave_group(mc); + + spin_lock_bh(&mc->mca_lock); + if (del_timer(&mc->mca_timer)) + refcount_dec(&mc->mca_refcnt); + spin_unlock_bh(&mc->mca_lock); +} + +/* + * deleted ifmcaddr6 manipulation + */ +static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) +{ + struct ifmcaddr6 *pmc; + + /* this is an "ifmcaddr6" for convenience; only the fields below + * are actually used. In particular, the refcnt and users are not + * used for management of the delete list. Using the same structure + * for deleted items allows change reports to use common code with + * non-deleted or query-response MCA's. + */ + pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC); + if (!pmc) + return; + + spin_lock_bh(&im->mca_lock); + spin_lock_init(&pmc->mca_lock); + pmc->idev = im->idev; + in6_dev_hold(idev); + pmc->mca_addr = im->mca_addr; + pmc->mca_crcount = idev->mc_qrv; + pmc->mca_sfmode = im->mca_sfmode; + if (pmc->mca_sfmode == MCAST_INCLUDE) { + struct ip6_sf_list *psf; + + pmc->mca_tomb = im->mca_tomb; + pmc->mca_sources = im->mca_sources; + im->mca_tomb = im->mca_sources = NULL; + for (psf = pmc->mca_sources; psf; psf = psf->sf_next) + psf->sf_crcount = pmc->mca_crcount; + } + spin_unlock_bh(&im->mca_lock); + + spin_lock_bh(&idev->mc_lock); + pmc->next = idev->mc_tomb; + idev->mc_tomb = pmc; + spin_unlock_bh(&idev->mc_lock); +} + +static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) +{ + struct ifmcaddr6 *pmc, *pmc_prev; + struct ip6_sf_list *psf; + struct in6_addr *pmca = &im->mca_addr; + + spin_lock_bh(&idev->mc_lock); + pmc_prev = NULL; + for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) { + if (ipv6_addr_equal(&pmc->mca_addr, pmca)) + break; + pmc_prev = pmc; + } + if (pmc) { + if (pmc_prev) + pmc_prev->next = pmc->next; + else + idev->mc_tomb = pmc->next; + } + spin_unlock_bh(&idev->mc_lock); + + spin_lock_bh(&im->mca_lock); + if (pmc) { + im->idev = pmc->idev; + if (im->mca_sfmode == MCAST_INCLUDE) { + swap(im->mca_tomb, pmc->mca_tomb); + swap(im->mca_sources, pmc->mca_sources); + for (psf = im->mca_sources; psf; psf = psf->sf_next) + psf->sf_crcount = idev->mc_qrv; + } else { + im->mca_crcount = idev->mc_qrv; + } + in6_dev_put(pmc->idev); + ip6_mc_clear_src(pmc); + kfree(pmc); + } + spin_unlock_bh(&im->mca_lock); +} + +static void mld_clear_delrec(struct inet6_dev *idev) +{ + struct ifmcaddr6 *pmc, *nextpmc; + + spin_lock_bh(&idev->mc_lock); + pmc = idev->mc_tomb; + idev->mc_tomb = NULL; + spin_unlock_bh(&idev->mc_lock); + + for (; pmc; pmc = nextpmc) { + nextpmc = pmc->next; + ip6_mc_clear_src(pmc); + in6_dev_put(pmc->idev); + kfree(pmc); + } + + /* clear dead sources, too */ + read_lock_bh(&idev->lock); + for (pmc = idev->mc_list; pmc; pmc = pmc->next) { + struct ip6_sf_list *psf, *psf_next; + + spin_lock_bh(&pmc->mca_lock); + psf = pmc->mca_tomb; + pmc->mca_tomb = NULL; + spin_unlock_bh(&pmc->mca_lock); + for (; psf; psf = psf_next) { + psf_next = psf->sf_next; + kfree(psf); + } + } + read_unlock_bh(&idev->lock); +} + +static void mca_get(struct ifmcaddr6 *mc) +{ + refcount_inc(&mc->mca_refcnt); +} + +static void ma_put(struct ifmcaddr6 *mc) +{ + if (refcount_dec_and_test(&mc->mca_refcnt)) { + in6_dev_put(mc->idev); + kfree(mc); + } +} + +static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev, + const struct in6_addr *addr, + unsigned int mode) +{ + struct ifmcaddr6 *mc; + + mc = kzalloc(sizeof(*mc), GFP_ATOMIC); + if (!mc) + return NULL; + + timer_setup(&mc->mca_timer, igmp6_timer_handler, 0); + + mc->mca_addr = *addr; + mc->idev = idev; /* reference taken by caller */ + mc->mca_users = 1; + /* mca_stamp should be updated upon changes */ + mc->mca_cstamp = mc->mca_tstamp = jiffies; + refcount_set(&mc->mca_refcnt, 1); + spin_lock_init(&mc->mca_lock); + + mc->mca_sfmode = mode; + mc->mca_sfcount[mode] = 1; + + if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || + IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) + mc->mca_flags |= MAF_NOREPORT; + + return mc; +} + +/* + * device multicast group inc (add if not found) + */ +static int __ipv6_dev_mc_inc(struct net_device *dev, + const struct in6_addr *addr, unsigned int mode) +{ + struct ifmcaddr6 *mc; + struct inet6_dev *idev; + + ASSERT_RTNL(); + + /* we need to take a reference on idev */ + idev = in6_dev_get(dev); + + if (!idev) + return -EINVAL; + + write_lock_bh(&idev->lock); + if (idev->dead) { + write_unlock_bh(&idev->lock); + in6_dev_put(idev); + return -ENODEV; + } + + for (mc = idev->mc_list; mc; mc = mc->next) { + if (ipv6_addr_equal(&mc->mca_addr, addr)) { + mc->mca_users++; + write_unlock_bh(&idev->lock); + ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0); + in6_dev_put(idev); + return 0; + } + } + + mc = mca_alloc(idev, addr, mode); + if (!mc) { + write_unlock_bh(&idev->lock); + in6_dev_put(idev); + return -ENOMEM; + } + + mc->next = idev->mc_list; + idev->mc_list = mc; + + /* Hold this for the code below before we unlock, + * it is already exposed via idev->mc_list. + */ + mca_get(mc); + write_unlock_bh(&idev->lock); + + mld_del_delrec(idev, mc); + igmp6_group_added(mc); + ma_put(mc); + return 0; +} + +int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) +{ + return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE); +} +EXPORT_SYMBOL(ipv6_dev_mc_inc); + +/* + * device multicast group del + */ +int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) +{ + struct ifmcaddr6 *ma, **map; + + ASSERT_RTNL(); + + write_lock_bh(&idev->lock); + for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) { + if (ipv6_addr_equal(&ma->mca_addr, addr)) { + if (--ma->mca_users == 0) { + *map = ma->next; + write_unlock_bh(&idev->lock); + + igmp6_group_dropped(ma); + ip6_mc_clear_src(ma); + + ma_put(ma); + return 0; + } + write_unlock_bh(&idev->lock); + return 0; + } + } + write_unlock_bh(&idev->lock); + + return -ENOENT; +} + +int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr) +{ + struct inet6_dev *idev; + int err; + + ASSERT_RTNL(); + + idev = __in6_dev_get(dev); + if (!idev) + err = -ENODEV; + else + err = __ipv6_dev_mc_dec(idev, addr); + + return err; +} +EXPORT_SYMBOL(ipv6_dev_mc_dec); + +/* + * check if the interface/address pair is valid + */ +bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, + const struct in6_addr *src_addr) +{ + struct inet6_dev *idev; + struct ifmcaddr6 *mc; + bool rv = false; + + rcu_read_lock(); + idev = __in6_dev_get(dev); + if (idev) { + read_lock_bh(&idev->lock); + for (mc = idev->mc_list; mc; mc = mc->next) { + if (ipv6_addr_equal(&mc->mca_addr, group)) + break; + } + if (mc) { + if (src_addr && !ipv6_addr_any(src_addr)) { + struct ip6_sf_list *psf; + + spin_lock_bh(&mc->mca_lock); + for (psf = mc->mca_sources; psf; psf = psf->sf_next) { + if (ipv6_addr_equal(&psf->sf_addr, src_addr)) + break; + } + if (psf) + rv = psf->sf_count[MCAST_INCLUDE] || + psf->sf_count[MCAST_EXCLUDE] != + mc->mca_sfcount[MCAST_EXCLUDE]; + else + rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0; + spin_unlock_bh(&mc->mca_lock); + } else + rv = true; /* don't filter unspecified source */ + } + read_unlock_bh(&idev->lock); + } + rcu_read_unlock(); + return rv; +} + +static void mld_gq_start_timer(struct inet6_dev *idev) +{ + unsigned long tv = prandom_u32() % idev->mc_maxdelay; + + idev->mc_gq_running = 1; + if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) + in6_dev_hold(idev); +} + +static void mld_gq_stop_timer(struct inet6_dev *idev) +{ + idev->mc_gq_running = 0; + if (del_timer(&idev->mc_gq_timer)) + __in6_dev_put(idev); +} + +static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay) +{ + unsigned long tv = prandom_u32() % delay; + + if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) + in6_dev_hold(idev); +} + +static void mld_ifc_stop_timer(struct inet6_dev *idev) +{ + idev->mc_ifc_count = 0; + if (del_timer(&idev->mc_ifc_timer)) + __in6_dev_put(idev); +} + +static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay) +{ + unsigned long tv = prandom_u32() % delay; + + if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2)) + in6_dev_hold(idev); +} + +static void mld_dad_stop_timer(struct inet6_dev *idev) +{ + if (del_timer(&idev->mc_dad_timer)) + __in6_dev_put(idev); +} + +/* + * IGMP handling (alias multicast ICMPv6 messages) + */ + +static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) +{ + unsigned long delay = resptime; + + /* Do not start timer for these addresses */ + if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || + IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) + return; + + if (del_timer(&ma->mca_timer)) { + refcount_dec(&ma->mca_refcnt); + delay = ma->mca_timer.expires - jiffies; + } + + if (delay >= resptime) + delay = prandom_u32() % resptime; + + ma->mca_timer.expires = jiffies + delay; + if (!mod_timer(&ma->mca_timer, jiffies + delay)) + refcount_inc(&ma->mca_refcnt); + ma->mca_flags |= MAF_TIMER_RUNNING; +} + +/* mark EXCLUDE-mode sources */ +static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, + const struct in6_addr *srcs) +{ + struct ip6_sf_list *psf; + int i, scount; + + scount = 0; + for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { + if (scount == nsrcs) + break; + for (i = 0; i < nsrcs; i++) { + /* skip inactive filters */ + if (psf->sf_count[MCAST_INCLUDE] || + pmc->mca_sfcount[MCAST_EXCLUDE] != + psf->sf_count[MCAST_EXCLUDE]) + break; + if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { + scount++; + break; + } + } + } + pmc->mca_flags &= ~MAF_GSQUERY; + if (scount == nsrcs) /* all sources excluded */ + return false; + return true; +} + +static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, + const struct in6_addr *srcs) +{ + struct ip6_sf_list *psf; + int i, scount; + + if (pmc->mca_sfmode == MCAST_EXCLUDE) + return mld_xmarksources(pmc, nsrcs, srcs); + + /* mark INCLUDE-mode sources */ + + scount = 0; + for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { + if (scount == nsrcs) + break; + for (i = 0; i < nsrcs; i++) { + if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { + psf->sf_gsresp = 1; + scount++; + break; + } + } + } + if (!scount) { + pmc->mca_flags &= ~MAF_GSQUERY; + return false; + } + pmc->mca_flags |= MAF_GSQUERY; + return true; +} + +static int mld_force_mld_version(const struct inet6_dev *idev) +{ + /* Normally, both are 0 here. If enforcement to a particular is + * being used, individual device enforcement will have a lower + * precedence over 'all' device (.../conf/all/force_mld_version). + */ + + if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0) + return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version; + else + return idev->cnf.force_mld_version; +} + +static bool mld_in_v2_mode_only(const struct inet6_dev *idev) +{ + return mld_force_mld_version(idev) == 2; +} + +static bool mld_in_v1_mode_only(const struct inet6_dev *idev) +{ + return mld_force_mld_version(idev) == 1; +} + +static bool mld_in_v1_mode(const struct inet6_dev *idev) +{ + if (mld_in_v2_mode_only(idev)) + return false; + if (mld_in_v1_mode_only(idev)) + return true; + if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen)) + return true; + + return false; +} + +static void mld_set_v1_mode(struct inet6_dev *idev) +{ + /* RFC3810, relevant sections: + * - 9.1. Robustness Variable + * - 9.2. Query Interval + * - 9.3. Query Response Interval + * - 9.12. Older Version Querier Present Timeout + */ + unsigned long switchback; + + switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri; + + idev->mc_v1_seen = jiffies + switchback; +} + +static void mld_update_qrv(struct inet6_dev *idev, + const struct mld2_query *mlh2) +{ + /* RFC3810, relevant sections: + * - 5.1.8. QRV (Querier's Robustness Variable) + * - 9.1. Robustness Variable + */ + + /* The value of the Robustness Variable MUST NOT be zero, + * and SHOULD NOT be one. Catch this here if we ever run + * into such a case in future. + */ + const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv); + WARN_ON(idev->mc_qrv == 0); + + if (mlh2->mld2q_qrv > 0) + idev->mc_qrv = mlh2->mld2q_qrv; + + if (unlikely(idev->mc_qrv < min_qrv)) { + net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n", + idev->mc_qrv, min_qrv); + idev->mc_qrv = min_qrv; + } +} + +static void mld_update_qi(struct inet6_dev *idev, + const struct mld2_query *mlh2) +{ + /* RFC3810, relevant sections: + * - 5.1.9. QQIC (Querier's Query Interval Code) + * - 9.2. Query Interval + * - 9.12. Older Version Querier Present Timeout + * (the [Query Interval] in the last Query received) + */ + unsigned long mc_qqi; + + if (mlh2->mld2q_qqic < 128) { + mc_qqi = mlh2->mld2q_qqic; + } else { + unsigned long mc_man, mc_exp; + + mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic); + mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic); + + mc_qqi = (mc_man | 0x10) << (mc_exp + 3); + } + + idev->mc_qi = mc_qqi * HZ; +} + +static void mld_update_qri(struct inet6_dev *idev, + const struct mld2_query *mlh2) +{ + /* RFC3810, relevant sections: + * - 5.1.3. Maximum Response Code + * - 9.3. Query Response Interval + */ + idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2)); +} + +static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld, + unsigned long *max_delay, bool v1_query) +{ + unsigned long mldv1_md; + + /* Ignore v1 queries */ + if (mld_in_v2_mode_only(idev)) + return -EINVAL; + + mldv1_md = ntohs(mld->mld_maxdelay); + + /* When in MLDv1 fallback and a MLDv2 router start-up being + * unaware of current MLDv1 operation, the MRC == MRD mapping + * only works when the exponential algorithm is not being + * used (as MLDv1 is unaware of such things). + * + * According to the RFC author, the MLDv2 implementations + * he's aware of all use a MRC < 32768 on start up queries. + * + * Thus, should we *ever* encounter something else larger + * than that, just assume the maximum possible within our + * reach. + */ + if (!v1_query) + mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT); + + *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL); + + /* MLDv1 router present: we need to go into v1 mode *only* + * when an MLDv1 query is received as per section 9.12. of + * RFC3810! And we know from RFC2710 section 3.7 that MLDv1 + * queries MUST be of exactly 24 octets. + */ + if (v1_query) + mld_set_v1_mode(idev); + + /* cancel MLDv2 report timer */ + mld_gq_stop_timer(idev); + /* cancel the interface change timer */ + mld_ifc_stop_timer(idev); + /* clear deleted report items */ + mld_clear_delrec(idev); + + return 0; +} + +static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld, + unsigned long *max_delay) +{ + *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL); + + mld_update_qrv(idev, mld); + mld_update_qi(idev, mld); + mld_update_qri(idev, mld); + + idev->mc_maxdelay = *max_delay; + + return 0; +} + +/* called with rcu_read_lock() */ +int igmp6_event_query(struct sk_buff *skb) +{ + struct mld2_query *mlh2 = NULL; + struct ifmcaddr6 *ma; + const struct in6_addr *group; + unsigned long max_delay; + struct inet6_dev *idev; + struct mld_msg *mld; + int group_type; + int mark = 0; + int len, err; + + if (!pskb_may_pull(skb, sizeof(struct in6_addr))) + return -EINVAL; + + /* compute payload length excluding extension headers */ + len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); + len -= skb_network_header_len(skb); + + /* RFC3810 6.2 + * Upon reception of an MLD message that contains a Query, the node + * checks if the source address of the message is a valid link-local + * address, if the Hop Limit is set to 1, and if the Router Alert + * option is present in the Hop-By-Hop Options header of the IPv6 + * packet. If any of these checks fails, the packet is dropped. + */ + if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) || + ipv6_hdr(skb)->hop_limit != 1 || + !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) || + IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD)) + return -EINVAL; + + idev = __in6_dev_get(skb->dev); + if (!idev) + return 0; + + mld = (struct mld_msg *)icmp6_hdr(skb); + group = &mld->mld_mca; + group_type = ipv6_addr_type(group); + + if (group_type != IPV6_ADDR_ANY && + !(group_type&IPV6_ADDR_MULTICAST)) + return -EINVAL; + + if (len < MLD_V1_QUERY_LEN) { + return -EINVAL; + } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) { + err = mld_process_v1(idev, mld, &max_delay, + len == MLD_V1_QUERY_LEN); + if (err < 0) + return err; + } else if (len >= MLD_V2_QUERY_LEN_MIN) { + int srcs_offset = sizeof(struct mld2_query) - + sizeof(struct icmp6hdr); + + if (!pskb_may_pull(skb, srcs_offset)) + return -EINVAL; + + mlh2 = (struct mld2_query *)skb_transport_header(skb); + + err = mld_process_v2(idev, mlh2, &max_delay); + if (err < 0) + return err; + + if (group_type == IPV6_ADDR_ANY) { /* general query */ + if (mlh2->mld2q_nsrcs) + return -EINVAL; /* no sources allowed */ + + mld_gq_start_timer(idev); + return 0; + } + /* mark sources to include, if group & source-specific */ + if (mlh2->mld2q_nsrcs != 0) { + if (!pskb_may_pull(skb, srcs_offset + + ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) + return -EINVAL; + + mlh2 = (struct mld2_query *)skb_transport_header(skb); + mark = 1; + } + } else { + return -EINVAL; + } + + read_lock_bh(&idev->lock); + if (group_type == IPV6_ADDR_ANY) { + for (ma = idev->mc_list; ma; ma = ma->next) { + spin_lock_bh(&ma->mca_lock); + igmp6_group_queried(ma, max_delay); + spin_unlock_bh(&ma->mca_lock); + } + } else { + for (ma = idev->mc_list; ma; ma = ma->next) { + if (!ipv6_addr_equal(group, &ma->mca_addr)) + continue; + spin_lock_bh(&ma->mca_lock); + if (ma->mca_flags & MAF_TIMER_RUNNING) { + /* gsquery <- gsquery && mark */ + if (!mark) + ma->mca_flags &= ~MAF_GSQUERY; + } else { + /* gsquery <- mark */ + if (mark) + ma->mca_flags |= MAF_GSQUERY; + else + ma->mca_flags &= ~MAF_GSQUERY; + } + if (!(ma->mca_flags & MAF_GSQUERY) || + mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs)) + igmp6_group_queried(ma, max_delay); + spin_unlock_bh(&ma->mca_lock); + break; + } + } + read_unlock_bh(&idev->lock); + + return 0; +} + +/* called with rcu_read_lock() */ +int igmp6_event_report(struct sk_buff *skb) +{ + struct ifmcaddr6 *ma; + struct inet6_dev *idev; + struct mld_msg *mld; + int addr_type; + + /* Our own report looped back. Ignore it. */ + if (skb->pkt_type == PACKET_LOOPBACK) + return 0; + + /* send our report if the MC router may not have heard this report */ + if (skb->pkt_type != PACKET_MULTICAST && + skb->pkt_type != PACKET_BROADCAST) + return 0; + + if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr))) + return -EINVAL; + + mld = (struct mld_msg *)icmp6_hdr(skb); + + /* Drop reports with not link local source */ + addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr); + if (addr_type != IPV6_ADDR_ANY && + !(addr_type&IPV6_ADDR_LINKLOCAL)) + return -EINVAL; + + idev = __in6_dev_get(skb->dev); + if (!idev) + return -ENODEV; + + /* + * Cancel the timer for this group + */ + + read_lock_bh(&idev->lock); + for (ma = idev->mc_list; ma; ma = ma->next) { + if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) { + spin_lock(&ma->mca_lock); + if (del_timer(&ma->mca_timer)) + refcount_dec(&ma->mca_refcnt); + ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); + spin_unlock(&ma->mca_lock); + break; + } + } + read_unlock_bh(&idev->lock); + return 0; +} + +static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, + int gdeleted, int sdeleted) +{ + switch (type) { + case MLD2_MODE_IS_INCLUDE: + case MLD2_MODE_IS_EXCLUDE: + if (gdeleted || sdeleted) + return false; + if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { + if (pmc->mca_sfmode == MCAST_INCLUDE) + return true; + /* don't include if this source is excluded + * in all filters + */ + if (psf->sf_count[MCAST_INCLUDE]) + return type == MLD2_MODE_IS_INCLUDE; + return pmc->mca_sfcount[MCAST_EXCLUDE] == + psf->sf_count[MCAST_EXCLUDE]; + } + return false; + case MLD2_CHANGE_TO_INCLUDE: + if (gdeleted || sdeleted) + return false; + return psf->sf_count[MCAST_INCLUDE] != 0; + case MLD2_CHANGE_TO_EXCLUDE: + if (gdeleted || sdeleted) + return false; + if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || + psf->sf_count[MCAST_INCLUDE]) + return false; + return pmc->mca_sfcount[MCAST_EXCLUDE] == + psf->sf_count[MCAST_EXCLUDE]; + case MLD2_ALLOW_NEW_SOURCES: + if (gdeleted || !psf->sf_crcount) + return false; + return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; + case MLD2_BLOCK_OLD_SOURCES: + if (pmc->mca_sfmode == MCAST_INCLUDE) + return gdeleted || (psf->sf_crcount && sdeleted); + return psf->sf_crcount && !gdeleted && !sdeleted; + } + return false; +} + +static int +mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) +{ + struct ip6_sf_list *psf; + int scount = 0; + + for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { + if (!is_in(pmc, psf, type, gdeleted, sdeleted)) + continue; + scount++; + } + return scount; +} + +static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb, + struct net_device *dev, + const struct in6_addr *saddr, + const struct in6_addr *daddr, + int proto, int len) +{ + struct ipv6hdr *hdr; + + skb->protocol = htons(ETH_P_IPV6); + skb->dev = dev; + + skb_reset_network_header(skb); + skb_put(skb, sizeof(struct ipv6hdr)); + hdr = ipv6_hdr(skb); + + ip6_flow_hdr(hdr, 0, 0); + + hdr->payload_len = htons(len); + hdr->nexthdr = proto; + hdr->hop_limit = inet6_sk(sk)->hop_limit; + + hdr->saddr = *saddr; + hdr->daddr = *daddr; +} + +static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu) +{ + struct net_device *dev = idev->dev; + struct net *net = dev_net(dev); + struct sock *sk = net->ipv6.igmp_sk; + struct sk_buff *skb; + struct mld2_report *pmr; + struct in6_addr addr_buf; + const struct in6_addr *saddr; + int hlen = LL_RESERVED_SPACE(dev); + int tlen = dev->needed_tailroom; + unsigned int size = mtu + hlen + tlen; + int err; + u8 ra[8] = { IPPROTO_ICMPV6, 0, + IPV6_TLV_ROUTERALERT, 2, 0, 0, + IPV6_TLV_PADN, 0 }; + + /* we assume size > sizeof(ra) here */ + skb = sock_alloc_send_skb(sk, size, 1, &err); + if (!skb) + return NULL; + + skb->priority = TC_PRIO_CONTROL; + skb_reserve(skb, hlen); + skb_tailroom_reserve(skb, mtu, tlen); + + if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) { + /* <draft-ietf-magma-mld-source-05.txt>: + * use unspecified address as the source address + * when a valid link-local address is not available. + */ + saddr = &in6addr_any; + } else + saddr = &addr_buf; + + ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); + + skb_put_data(skb, ra, sizeof(ra)); + + skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); + skb_put(skb, sizeof(*pmr)); + pmr = (struct mld2_report *)skb_transport_header(skb); + pmr->mld2r_type = ICMPV6_MLD2_REPORT; + pmr->mld2r_resv1 = 0; + pmr->mld2r_cksum = 0; + pmr->mld2r_resv2 = 0; + pmr->mld2r_ngrec = 0; + return skb; +} + +static void mld_sendpack(struct sk_buff *skb) +{ + struct ipv6hdr *pip6 = ipv6_hdr(skb); + struct mld2_report *pmr = + (struct mld2_report *)skb_transport_header(skb); + int payload_len, mldlen; + struct inet6_dev *idev; + struct net *net = dev_net(skb->dev); + int err; + struct flowi6 fl6; + struct dst_entry *dst; + + rcu_read_lock(); + idev = __in6_dev_get(skb->dev); + IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); + + payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) - + sizeof(*pip6); + mldlen = skb_tail_pointer(skb) - skb_transport_header(skb); + pip6->payload_len = htons(payload_len); + + pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, + IPPROTO_ICMPV6, + csum_partial(skb_transport_header(skb), + mldlen, 0)); + + icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, + &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, + skb->dev->ifindex); + dst = icmp6_dst_alloc(skb->dev, &fl6); + + err = 0; + if (IS_ERR(dst)) { + err = PTR_ERR(dst); + dst = NULL; + } + skb_dst_set(skb, dst); + if (err) + goto err_out; + + err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, + net, net->ipv6.igmp_sk, skb, NULL, skb->dev, + dst_output); +out: + if (!err) { + ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT); + ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); + } else { + IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); + } + + rcu_read_unlock(); + return; + +err_out: + kfree_skb(skb); + goto out; +} + +static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) +{ + return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel); +} + +static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, + int type, struct mld2_grec **ppgr, unsigned int mtu) +{ + struct mld2_report *pmr; + struct mld2_grec *pgr; + + if (!skb) { + skb = mld_newpack(pmc->idev, mtu); + if (!skb) + return NULL; + } + pgr = skb_put(skb, sizeof(struct mld2_grec)); + pgr->grec_type = type; + pgr->grec_auxwords = 0; + pgr->grec_nsrcs = 0; + pgr->grec_mca = pmc->mca_addr; /* structure copy */ + pmr = (struct mld2_report *)skb_transport_header(skb); + pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); + *ppgr = pgr; + return skb; +} + +#define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) + +static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, + int type, int gdeleted, int sdeleted, int crsend) +{ + struct inet6_dev *idev = pmc->idev; + struct net_device *dev = idev->dev; + struct mld2_report *pmr; + struct mld2_grec *pgr = NULL; + struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; + int scount, stotal, first, isquery, truncate; + unsigned int mtu; + + if (pmc->mca_flags & MAF_NOREPORT) + return skb; + + mtu = READ_ONCE(dev->mtu); + if (mtu < IPV6_MIN_MTU) + return skb; + + isquery = type == MLD2_MODE_IS_INCLUDE || + type == MLD2_MODE_IS_EXCLUDE; + truncate = type == MLD2_MODE_IS_EXCLUDE || + type == MLD2_CHANGE_TO_EXCLUDE; + + stotal = scount = 0; + + psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; + + if (!*psf_list) + goto empty_source; + + pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL; + + /* EX and TO_EX get a fresh packet, if needed */ + if (truncate) { + if (pmr && pmr->mld2r_ngrec && + AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { + if (skb) + mld_sendpack(skb); + skb = mld_newpack(idev, mtu); + } + } + first = 1; + psf_prev = NULL; + for (psf = *psf_list; psf; psf = psf_next) { + struct in6_addr *psrc; + + psf_next = psf->sf_next; + + if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) { + psf_prev = psf; + continue; + } + + /* Based on RFC3810 6.1. Should not send source-list change + * records when there is a filter mode change. + */ + if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) || + (!gdeleted && pmc->mca_crcount)) && + (type == MLD2_ALLOW_NEW_SOURCES || + type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) + goto decrease_sf_crcount; + + /* clear marks on query responses */ + if (isquery) + psf->sf_gsresp = 0; + + if (AVAILABLE(skb) < sizeof(*psrc) + + first*sizeof(struct mld2_grec)) { + if (truncate && !first) + break; /* truncate these */ + if (pgr) + pgr->grec_nsrcs = htons(scount); + if (skb) + mld_sendpack(skb); + skb = mld_newpack(idev, mtu); + first = 1; + scount = 0; + } + if (first) { + skb = add_grhead(skb, pmc, type, &pgr, mtu); + first = 0; + } + if (!skb) + return NULL; + psrc = skb_put(skb, sizeof(*psrc)); + *psrc = psf->sf_addr; + scount++; stotal++; + if ((type == MLD2_ALLOW_NEW_SOURCES || + type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { +decrease_sf_crcount: + psf->sf_crcount--; + if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { + if (psf_prev) + psf_prev->sf_next = psf->sf_next; + else + *psf_list = psf->sf_next; + kfree(psf); + continue; + } + } + psf_prev = psf; + } + +empty_source: + if (!stotal) { + if (type == MLD2_ALLOW_NEW_SOURCES || + type == MLD2_BLOCK_OLD_SOURCES) + return skb; + if (pmc->mca_crcount || isquery || crsend) { + /* make sure we have room for group header */ + if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { + mld_sendpack(skb); + skb = NULL; /* add_grhead will get a new one */ + } + skb = add_grhead(skb, pmc, type, &pgr, mtu); + } + } + if (pgr) + pgr->grec_nsrcs = htons(scount); + + if (isquery) + pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ + return skb; +} + +static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) +{ + struct sk_buff *skb = NULL; + int type; + + read_lock_bh(&idev->lock); + if (!pmc) { + for (pmc = idev->mc_list; pmc; pmc = pmc->next) { + if (pmc->mca_flags & MAF_NOREPORT) + continue; + spin_lock_bh(&pmc->mca_lock); + if (pmc->mca_sfcount[MCAST_EXCLUDE]) + type = MLD2_MODE_IS_EXCLUDE; + else + type = MLD2_MODE_IS_INCLUDE; + skb = add_grec(skb, pmc, type, 0, 0, 0); + spin_unlock_bh(&pmc->mca_lock); + } + } else { + spin_lock_bh(&pmc->mca_lock); + if (pmc->mca_sfcount[MCAST_EXCLUDE]) + type = MLD2_MODE_IS_EXCLUDE; + else + type = MLD2_MODE_IS_INCLUDE; + skb = add_grec(skb, pmc, type, 0, 0, 0); + spin_unlock_bh(&pmc->mca_lock); + } + read_unlock_bh(&idev->lock); + if (skb) + mld_sendpack(skb); +} + +/* + * remove zero-count source records from a source filter list + */ +static void mld_clear_zeros(struct ip6_sf_list **ppsf) +{ + struct ip6_sf_list *psf_prev, *psf_next, *psf; + + psf_prev = NULL; + for (psf = *ppsf; psf; psf = psf_next) { + psf_next = psf->sf_next; + if (psf->sf_crcount == 0) { + if (psf_prev) + psf_prev->sf_next = psf->sf_next; + else + *ppsf = psf->sf_next; + kfree(psf); + } else + psf_prev = psf; + } +} + +static void mld_send_cr(struct inet6_dev *idev) +{ + struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; + struct sk_buff *skb = NULL; + int type, dtype; + + read_lock_bh(&idev->lock); + spin_lock(&idev->mc_lock); + + /* deleted MCA's */ + pmc_prev = NULL; + for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) { + pmc_next = pmc->next; + if (pmc->mca_sfmode == MCAST_INCLUDE) { + type = MLD2_BLOCK_OLD_SOURCES; + dtype = MLD2_BLOCK_OLD_SOURCES; + skb = add_grec(skb, pmc, type, 1, 0, 0); + skb = add_grec(skb, pmc, dtype, 1, 1, 0); + } + if (pmc->mca_crcount) { + if (pmc->mca_sfmode == MCAST_EXCLUDE) { + type = MLD2_CHANGE_TO_INCLUDE; + skb = add_grec(skb, pmc, type, 1, 0, 0); + } + pmc->mca_crcount--; + if (pmc->mca_crcount == 0) { + mld_clear_zeros(&pmc->mca_tomb); + mld_clear_zeros(&pmc->mca_sources); + } + } + if (pmc->mca_crcount == 0 && !pmc->mca_tomb && + !pmc->mca_sources) { + if (pmc_prev) + pmc_prev->next = pmc_next; + else + idev->mc_tomb = pmc_next; + in6_dev_put(pmc->idev); + kfree(pmc); + } else + pmc_prev = pmc; + } + spin_unlock(&idev->mc_lock); + + /* change recs */ + for (pmc = idev->mc_list; pmc; pmc = pmc->next) { + spin_lock_bh(&pmc->mca_lock); + if (pmc->mca_sfcount[MCAST_EXCLUDE]) { + type = MLD2_BLOCK_OLD_SOURCES; + dtype = MLD2_ALLOW_NEW_SOURCES; + } else { + type = MLD2_ALLOW_NEW_SOURCES; + dtype = MLD2_BLOCK_OLD_SOURCES; + } + skb = add_grec(skb, pmc, type, 0, 0, 0); + skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */ + + /* filter mode changes */ + if (pmc->mca_crcount) { + if (pmc->mca_sfmode == MCAST_EXCLUDE) + type = MLD2_CHANGE_TO_EXCLUDE; + else + type = MLD2_CHANGE_TO_INCLUDE; + skb = add_grec(skb, pmc, type, 0, 0, 0); + pmc->mca_crcount--; + } + spin_unlock_bh(&pmc->mca_lock); + } + read_unlock_bh(&idev->lock); + if (!skb) + return; + (void) mld_sendpack(skb); +} + +static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) +{ + struct net *net = dev_net(dev); + struct sock *sk = net->ipv6.igmp_sk; + struct inet6_dev *idev; + struct sk_buff *skb; + struct mld_msg *hdr; + const struct in6_addr *snd_addr, *saddr; + struct in6_addr addr_buf; + int hlen = LL_RESERVED_SPACE(dev); + int tlen = dev->needed_tailroom; + int err, len, payload_len, full_len; + u8 ra[8] = { IPPROTO_ICMPV6, 0, + IPV6_TLV_ROUTERALERT, 2, 0, 0, + IPV6_TLV_PADN, 0 }; + struct flowi6 fl6; + struct dst_entry *dst; + + if (type == ICMPV6_MGM_REDUCTION) + snd_addr = &in6addr_linklocal_allrouters; + else + snd_addr = addr; + + len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); + payload_len = len + sizeof(ra); + full_len = sizeof(struct ipv6hdr) + payload_len; + + rcu_read_lock(); + IP6_UPD_PO_STATS(net, __in6_dev_get(dev), + IPSTATS_MIB_OUT, full_len); + rcu_read_unlock(); + + skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err); + + if (!skb) { + rcu_read_lock(); + IP6_INC_STATS(net, __in6_dev_get(dev), + IPSTATS_MIB_OUTDISCARDS); + rcu_read_unlock(); + return; + } + skb->priority = TC_PRIO_CONTROL; + skb_reserve(skb, hlen); + + if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { + /* <draft-ietf-magma-mld-source-05.txt>: + * use unspecified address as the source address + * when a valid link-local address is not available. + */ + saddr = &in6addr_any; + } else + saddr = &addr_buf; + + ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); + + skb_put_data(skb, ra, sizeof(ra)); + + hdr = skb_put_zero(skb, sizeof(struct mld_msg)); + hdr->mld_type = type; + hdr->mld_mca = *addr; + + hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, + IPPROTO_ICMPV6, + csum_partial(hdr, len, 0)); + + rcu_read_lock(); + idev = __in6_dev_get(skb->dev); + + icmpv6_flow_init(sk, &fl6, type, + &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, + skb->dev->ifindex); + dst = icmp6_dst_alloc(skb->dev, &fl6); + if (IS_ERR(dst)) { + err = PTR_ERR(dst); + goto err_out; + } + + skb_dst_set(skb, dst); + err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, + net, sk, skb, NULL, skb->dev, + dst_output); +out: + if (!err) { + ICMP6MSGOUT_INC_STATS(net, idev, type); + ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); + } else + IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); + + rcu_read_unlock(); + return; + +err_out: + kfree_skb(skb); + goto out; +} + +static void mld_send_initial_cr(struct inet6_dev *idev) +{ + struct sk_buff *skb; + struct ifmcaddr6 *pmc; + int type; + + if (mld_in_v1_mode(idev)) + return; + + skb = NULL; + read_lock_bh(&idev->lock); + for (pmc = idev->mc_list; pmc; pmc = pmc->next) { + spin_lock_bh(&pmc->mca_lock); + if (pmc->mca_sfcount[MCAST_EXCLUDE]) + type = MLD2_CHANGE_TO_EXCLUDE; + else + type = MLD2_ALLOW_NEW_SOURCES; + skb = add_grec(skb, pmc, type, 0, 0, 1); + spin_unlock_bh(&pmc->mca_lock); + } + read_unlock_bh(&idev->lock); + if (skb) + mld_sendpack(skb); +} + +void ipv6_mc_dad_complete(struct inet6_dev *idev) +{ + idev->mc_dad_count = idev->mc_qrv; + if (idev->mc_dad_count) { + mld_send_initial_cr(idev); + idev->mc_dad_count--; + if (idev->mc_dad_count) + mld_dad_start_timer(idev, + unsolicited_report_interval(idev)); + } +} + +static void mld_dad_timer_expire(struct timer_list *t) +{ + struct inet6_dev *idev = from_timer(idev, t, mc_dad_timer); + + mld_send_initial_cr(idev); + if (idev->mc_dad_count) { + idev->mc_dad_count--; + if (idev->mc_dad_count) + mld_dad_start_timer(idev, + unsolicited_report_interval(idev)); + } + in6_dev_put(idev); +} + +static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, + const struct in6_addr *psfsrc) +{ + struct ip6_sf_list *psf, *psf_prev; + int rv = 0; + + psf_prev = NULL; + for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { + if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) + break; + psf_prev = psf; + } + if (!psf || psf->sf_count[sfmode] == 0) { + /* source filter not found, or count wrong => bug */ + return -ESRCH; + } + psf->sf_count[sfmode]--; + if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { + struct inet6_dev *idev = pmc->idev; + + /* no more filters for this source */ + if (psf_prev) + psf_prev->sf_next = psf->sf_next; + else + pmc->mca_sources = psf->sf_next; + if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && + !mld_in_v1_mode(idev)) { + psf->sf_crcount = idev->mc_qrv; + psf->sf_next = pmc->mca_tomb; + pmc->mca_tomb = psf; + rv = 1; + } else + kfree(psf); + } + return rv; +} + +static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca, + int sfmode, int sfcount, const struct in6_addr *psfsrc, + int delta) +{ + struct ifmcaddr6 *pmc; + int changerec = 0; + int i, err; + + if (!idev) + return -ENODEV; + read_lock_bh(&idev->lock); + for (pmc = idev->mc_list; pmc; pmc = pmc->next) { + if (ipv6_addr_equal(pmca, &pmc->mca_addr)) + break; + } + if (!pmc) { + /* MCA not found?? bug */ + read_unlock_bh(&idev->lock); + return -ESRCH; + } + spin_lock_bh(&pmc->mca_lock); + sf_markstate(pmc); + if (!delta) { + if (!pmc->mca_sfcount[sfmode]) { + spin_unlock_bh(&pmc->mca_lock); + read_unlock_bh(&idev->lock); + return -EINVAL; + } + pmc->mca_sfcount[sfmode]--; + } + err = 0; + for (i = 0; i < sfcount; i++) { + int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); + + changerec |= rv > 0; + if (!err && rv < 0) + err = rv; + } + if (pmc->mca_sfmode == MCAST_EXCLUDE && + pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && + pmc->mca_sfcount[MCAST_INCLUDE]) { + struct ip6_sf_list *psf; + + /* filter mode change */ + pmc->mca_sfmode = MCAST_INCLUDE; + pmc->mca_crcount = idev->mc_qrv; + idev->mc_ifc_count = pmc->mca_crcount; + for (psf = pmc->mca_sources; psf; psf = psf->sf_next) + psf->sf_crcount = 0; + mld_ifc_event(pmc->idev); + } else if (sf_setstate(pmc) || changerec) + mld_ifc_event(pmc->idev); + spin_unlock_bh(&pmc->mca_lock); + read_unlock_bh(&idev->lock); + return err; +} + +/* + * Add multicast single-source filter to the interface list + */ +static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, + const struct in6_addr *psfsrc) +{ + struct ip6_sf_list *psf, *psf_prev; + + psf_prev = NULL; + for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { + if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) + break; + psf_prev = psf; + } + if (!psf) { + psf = kzalloc(sizeof(*psf), GFP_ATOMIC); + if (!psf) + return -ENOBUFS; + + psf->sf_addr = *psfsrc; + if (psf_prev) { + psf_prev->sf_next = psf; + } else + pmc->mca_sources = psf; + } + psf->sf_count[sfmode]++; + return 0; +} + +static void sf_markstate(struct ifmcaddr6 *pmc) +{ + struct ip6_sf_list *psf; + int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; + + for (psf = pmc->mca_sources; psf; psf = psf->sf_next) + if (pmc->mca_sfcount[MCAST_EXCLUDE]) { + psf->sf_oldin = mca_xcount == + psf->sf_count[MCAST_EXCLUDE] && + !psf->sf_count[MCAST_INCLUDE]; + } else + psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; +} + +static int sf_setstate(struct ifmcaddr6 *pmc) +{ + struct ip6_sf_list *psf, *dpsf; + int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; + int qrv = pmc->idev->mc_qrv; + int new_in, rv; + + rv = 0; + for (psf = pmc->mca_sources; psf; psf = psf->sf_next) { + if (pmc->mca_sfcount[MCAST_EXCLUDE]) { + new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && + !psf->sf_count[MCAST_INCLUDE]; + } else + new_in = psf->sf_count[MCAST_INCLUDE] != 0; + if (new_in) { + if (!psf->sf_oldin) { + struct ip6_sf_list *prev = NULL; + + for (dpsf = pmc->mca_tomb; dpsf; + dpsf = dpsf->sf_next) { + if (ipv6_addr_equal(&dpsf->sf_addr, + &psf->sf_addr)) + break; + prev = dpsf; + } + if (dpsf) { + if (prev) + prev->sf_next = dpsf->sf_next; + else + pmc->mca_tomb = dpsf->sf_next; + kfree(dpsf); + } + psf->sf_crcount = qrv; + rv++; + } + } else if (psf->sf_oldin) { + psf->sf_crcount = 0; + /* + * add or update "delete" records if an active filter + * is now inactive + */ + for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next) + if (ipv6_addr_equal(&dpsf->sf_addr, + &psf->sf_addr)) + break; + if (!dpsf) { + dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); + if (!dpsf) + continue; + *dpsf = *psf; + /* pmc->mca_lock held by callers */ + dpsf->sf_next = pmc->mca_tomb; + pmc->mca_tomb = dpsf; + } + dpsf->sf_crcount = qrv; + rv++; + } + } + return rv; +} + +/* + * Add multicast source filter list to the interface list + */ +static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, + int sfmode, int sfcount, const struct in6_addr *psfsrc, + int delta) +{ + struct ifmcaddr6 *pmc; + int isexclude; + int i, err; + + if (!idev) + return -ENODEV; + read_lock_bh(&idev->lock); + for (pmc = idev->mc_list; pmc; pmc = pmc->next) { + if (ipv6_addr_equal(pmca, &pmc->mca_addr)) + break; + } + if (!pmc) { + /* MCA not found?? bug */ + read_unlock_bh(&idev->lock); + return -ESRCH; + } + spin_lock_bh(&pmc->mca_lock); + + sf_markstate(pmc); + isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; + if (!delta) + pmc->mca_sfcount[sfmode]++; + err = 0; + for (i = 0; i < sfcount; i++) { + err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]); + if (err) + break; + } + if (err) { + int j; + + if (!delta) + pmc->mca_sfcount[sfmode]--; + for (j = 0; j < i; j++) + ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]); + } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { + struct ip6_sf_list *psf; + + /* filter mode change */ + if (pmc->mca_sfcount[MCAST_EXCLUDE]) + pmc->mca_sfmode = MCAST_EXCLUDE; + else if (pmc->mca_sfcount[MCAST_INCLUDE]) + pmc->mca_sfmode = MCAST_INCLUDE; + /* else no filters; keep old mode for reports */ + + pmc->mca_crcount = idev->mc_qrv; + idev->mc_ifc_count = pmc->mca_crcount; + for (psf = pmc->mca_sources; psf; psf = psf->sf_next) + psf->sf_crcount = 0; + mld_ifc_event(idev); + } else if (sf_setstate(pmc)) + mld_ifc_event(idev); + spin_unlock_bh(&pmc->mca_lock); + read_unlock_bh(&idev->lock); + return err; +} + +static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) +{ + struct ip6_sf_list *psf, *nextpsf; + + for (psf = pmc->mca_tomb; psf; psf = nextpsf) { + nextpsf = psf->sf_next; + kfree(psf); + } + pmc->mca_tomb = NULL; + for (psf = pmc->mca_sources; psf; psf = nextpsf) { + nextpsf = psf->sf_next; + kfree(psf); + } + pmc->mca_sources = NULL; + pmc->mca_sfmode = MCAST_EXCLUDE; + pmc->mca_sfcount[MCAST_INCLUDE] = 0; + pmc->mca_sfcount[MCAST_EXCLUDE] = 1; +} + + +static void igmp6_join_group(struct ifmcaddr6 *ma) +{ + unsigned long delay; + + if (ma->mca_flags & MAF_NOREPORT) + return; + + igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); + + delay = prandom_u32() % unsolicited_report_interval(ma->idev); + + spin_lock_bh(&ma->mca_lock); + if (del_timer(&ma->mca_timer)) { + refcount_dec(&ma->mca_refcnt); + delay = ma->mca_timer.expires - jiffies; + } + + if (!mod_timer(&ma->mca_timer, jiffies + delay)) + refcount_inc(&ma->mca_refcnt); + ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; + spin_unlock_bh(&ma->mca_lock); +} + +static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, + struct inet6_dev *idev) +{ + int err; + + write_lock_bh(&iml->sflock); + if (!iml->sflist) { + /* any-source empty exclude case */ + err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); + } else { + err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, + iml->sflist->sl_count, iml->sflist->sl_addr, 0); + sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); + iml->sflist = NULL; + } + write_unlock_bh(&iml->sflock); + return err; +} + +static void igmp6_leave_group(struct ifmcaddr6 *ma) +{ + if (mld_in_v1_mode(ma->idev)) { + if (ma->mca_flags & MAF_LAST_REPORTER) + igmp6_send(&ma->mca_addr, ma->idev->dev, + ICMPV6_MGM_REDUCTION); + } else { + mld_add_delrec(ma->idev, ma); + mld_ifc_event(ma->idev); + } +} + +static void mld_gq_timer_expire(struct timer_list *t) +{ + struct inet6_dev *idev = from_timer(idev, t, mc_gq_timer); + + idev->mc_gq_running = 0; + mld_send_report(idev, NULL); + in6_dev_put(idev); +} + +static void mld_ifc_timer_expire(struct timer_list *t) +{ + struct inet6_dev *idev = from_timer(idev, t, mc_ifc_timer); + + mld_send_cr(idev); + if (idev->mc_ifc_count) { + idev->mc_ifc_count--; + if (idev->mc_ifc_count) + mld_ifc_start_timer(idev, + unsolicited_report_interval(idev)); + } + in6_dev_put(idev); +} + +static void mld_ifc_event(struct inet6_dev *idev) +{ + if (mld_in_v1_mode(idev)) + return; + idev->mc_ifc_count = idev->mc_qrv; + mld_ifc_start_timer(idev, 1); +} + +static void igmp6_timer_handler(struct timer_list *t) +{ + struct ifmcaddr6 *ma = from_timer(ma, t, mca_timer); + + if (mld_in_v1_mode(ma->idev)) + igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); + else + mld_send_report(ma->idev, ma); + + spin_lock(&ma->mca_lock); + ma->mca_flags |= MAF_LAST_REPORTER; + ma->mca_flags &= ~MAF_TIMER_RUNNING; + spin_unlock(&ma->mca_lock); + ma_put(ma); +} + +/* Device changing type */ + +void ipv6_mc_unmap(struct inet6_dev *idev) +{ + struct ifmcaddr6 *i; + + /* Install multicast list, except for all-nodes (already installed) */ + + read_lock_bh(&idev->lock); + for (i = idev->mc_list; i; i = i->next) + igmp6_group_dropped(i); + read_unlock_bh(&idev->lock); +} + +void ipv6_mc_remap(struct inet6_dev *idev) +{ + ipv6_mc_up(idev); +} + +/* Device going down */ + +void ipv6_mc_down(struct inet6_dev *idev) +{ + struct ifmcaddr6 *i; + + /* Withdraw multicast list */ + + read_lock_bh(&idev->lock); + + for (i = idev->mc_list; i; i = i->next) + igmp6_group_dropped(i); + + /* Should stop timer after group drop. or we will + * start timer again in mld_ifc_event() + */ + mld_ifc_stop_timer(idev); + mld_gq_stop_timer(idev); + mld_dad_stop_timer(idev); + read_unlock_bh(&idev->lock); +} + +static void ipv6_mc_reset(struct inet6_dev *idev) +{ + idev->mc_qrv = sysctl_mld_qrv; + idev->mc_qi = MLD_QI_DEFAULT; + idev->mc_qri = MLD_QRI_DEFAULT; + idev->mc_v1_seen = 0; + idev->mc_maxdelay = unsolicited_report_interval(idev); +} + +/* Device going up */ + +void ipv6_mc_up(struct inet6_dev *idev) +{ + struct ifmcaddr6 *i; + + /* Install multicast list, except for all-nodes (already installed) */ + + read_lock_bh(&idev->lock); + ipv6_mc_reset(idev); + for (i = idev->mc_list; i; i = i->next) { + mld_del_delrec(idev, i); + igmp6_group_added(i); + } + read_unlock_bh(&idev->lock); +} + +/* IPv6 device initialization. */ + +void ipv6_mc_init_dev(struct inet6_dev *idev) +{ + write_lock_bh(&idev->lock); + spin_lock_init(&idev->mc_lock); + idev->mc_gq_running = 0; + timer_setup(&idev->mc_gq_timer, mld_gq_timer_expire, 0); + idev->mc_tomb = NULL; + idev->mc_ifc_count = 0; + timer_setup(&idev->mc_ifc_timer, mld_ifc_timer_expire, 0); + timer_setup(&idev->mc_dad_timer, mld_dad_timer_expire, 0); + ipv6_mc_reset(idev); + write_unlock_bh(&idev->lock); +} + +/* + * Device is about to be destroyed: clean up. + */ + +void ipv6_mc_destroy_dev(struct inet6_dev *idev) +{ + struct ifmcaddr6 *i; + + /* Deactivate timers */ + ipv6_mc_down(idev); + mld_clear_delrec(idev); + + /* Delete all-nodes address. */ + /* We cannot call ipv6_dev_mc_dec() directly, our caller in + * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will + * fail. + */ + __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes); + + if (idev->cnf.forwarding) + __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); + + write_lock_bh(&idev->lock); + while ((i = idev->mc_list) != NULL) { + idev->mc_list = i->next; + + write_unlock_bh(&idev->lock); + ip6_mc_clear_src(i); + ma_put(i); + write_lock_bh(&idev->lock); + } + write_unlock_bh(&idev->lock); +} + +static void ipv6_mc_rejoin_groups(struct inet6_dev *idev) +{ + struct ifmcaddr6 *pmc; + + ASSERT_RTNL(); + + if (mld_in_v1_mode(idev)) { + read_lock_bh(&idev->lock); + for (pmc = idev->mc_list; pmc; pmc = pmc->next) + igmp6_join_group(pmc); + read_unlock_bh(&idev->lock); + } else + mld_send_report(idev, NULL); +} + +static int ipv6_mc_netdev_event(struct notifier_block *this, + unsigned long event, + void *ptr) +{ + struct net_device *dev = netdev_notifier_info_to_dev(ptr); + struct inet6_dev *idev = __in6_dev_get(dev); + + switch (event) { + case NETDEV_RESEND_IGMP: + if (idev) + ipv6_mc_rejoin_groups(idev); + break; + default: + break; + } + + return NOTIFY_DONE; +} + +static struct notifier_block igmp6_netdev_notifier = { + .notifier_call = ipv6_mc_netdev_event, +}; + +#ifdef CONFIG_PROC_FS +struct igmp6_mc_iter_state { + struct seq_net_private p; + struct net_device *dev; + struct inet6_dev *idev; +}; + +#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) + +static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) +{ + struct ifmcaddr6 *im = NULL; + struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); + struct net *net = seq_file_net(seq); + + state->idev = NULL; + for_each_netdev_rcu(net, state->dev) { + struct inet6_dev *idev; + idev = __in6_dev_get(state->dev); + if (!idev) + continue; + read_lock_bh(&idev->lock); + im = idev->mc_list; + if (im) { + state->idev = idev; + break; + } + read_unlock_bh(&idev->lock); + } + return im; +} + +static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) +{ + struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); + + im = im->next; + while (!im) { + if (likely(state->idev)) + read_unlock_bh(&state->idev->lock); + + state->dev = next_net_device_rcu(state->dev); + if (!state->dev) { + state->idev = NULL; + break; + } + state->idev = __in6_dev_get(state->dev); + if (!state->idev) + continue; + read_lock_bh(&state->idev->lock); + im = state->idev->mc_list; + } + return im; +} + +static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) +{ + struct ifmcaddr6 *im = igmp6_mc_get_first(seq); + if (im) + while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) + --pos; + return pos ? NULL : im; +} + +static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) + __acquires(RCU) +{ + rcu_read_lock(); + return igmp6_mc_get_idx(seq, *pos); +} + +static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) +{ + struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v); + + ++*pos; + return im; +} + +static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) + __releases(RCU) +{ + struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); + + if (likely(state->idev)) { + read_unlock_bh(&state->idev->lock); + state->idev = NULL; + } + state->dev = NULL; + rcu_read_unlock(); +} + +static int igmp6_mc_seq_show(struct seq_file *seq, void *v) +{ + struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; + struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); + + seq_printf(seq, + "%-4d %-15s %pi6 %5d %08X %ld\n", + state->dev->ifindex, state->dev->name, + &im->mca_addr, + im->mca_users, im->mca_flags, + (im->mca_flags&MAF_TIMER_RUNNING) ? + jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); + return 0; +} + +static const struct seq_operations igmp6_mc_seq_ops = { + .start = igmp6_mc_seq_start, + .next = igmp6_mc_seq_next, + .stop = igmp6_mc_seq_stop, + .show = igmp6_mc_seq_show, +}; + +struct igmp6_mcf_iter_state { + struct seq_net_private p; + struct net_device *dev; + struct inet6_dev *idev; + struct ifmcaddr6 *im; +}; + +#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) + +static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) +{ + struct ip6_sf_list *psf = NULL; + struct ifmcaddr6 *im = NULL; + struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); + struct net *net = seq_file_net(seq); + + state->idev = NULL; + state->im = NULL; + for_each_netdev_rcu(net, state->dev) { + struct inet6_dev *idev; + idev = __in6_dev_get(state->dev); + if (unlikely(idev == NULL)) + continue; + read_lock_bh(&idev->lock); + im = idev->mc_list; + if (likely(im)) { + spin_lock_bh(&im->mca_lock); + psf = im->mca_sources; + if (likely(psf)) { + state->im = im; + state->idev = idev; + break; + } + spin_unlock_bh(&im->mca_lock); + } + read_unlock_bh(&idev->lock); + } + return psf; +} + +static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) +{ + struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); + + psf = psf->sf_next; + while (!psf) { + spin_unlock_bh(&state->im->mca_lock); + state->im = state->im->next; + while (!state->im) { + if (likely(state->idev)) + read_unlock_bh(&state->idev->lock); + + state->dev = next_net_device_rcu(state->dev); + if (!state->dev) { + state->idev = NULL; + goto out; + } + state->idev = __in6_dev_get(state->dev); + if (!state->idev) + continue; + read_lock_bh(&state->idev->lock); + state->im = state->idev->mc_list; + } + if (!state->im) + break; + spin_lock_bh(&state->im->mca_lock); + psf = state->im->mca_sources; + } +out: + return psf; +} + +static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) +{ + struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); + if (psf) + while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) + --pos; + return pos ? NULL : psf; +} + +static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) + __acquires(RCU) +{ + rcu_read_lock(); + return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; +} + +static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) +{ + struct ip6_sf_list *psf; + if (v == SEQ_START_TOKEN) + psf = igmp6_mcf_get_first(seq); + else + psf = igmp6_mcf_get_next(seq, v); + ++*pos; + return psf; +} + +static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) + __releases(RCU) +{ + struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); + if (likely(state->im)) { + spin_unlock_bh(&state->im->mca_lock); + state->im = NULL; + } + if (likely(state->idev)) { + read_unlock_bh(&state->idev->lock); + state->idev = NULL; + } + state->dev = NULL; + rcu_read_unlock(); +} + +static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) +{ + struct ip6_sf_list *psf = (struct ip6_sf_list *)v; + struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); + + if (v == SEQ_START_TOKEN) { + seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n"); + } else { + seq_printf(seq, + "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", + state->dev->ifindex, state->dev->name, + &state->im->mca_addr, + &psf->sf_addr, + psf->sf_count[MCAST_INCLUDE], + psf->sf_count[MCAST_EXCLUDE]); + } + return 0; +} + +static const struct seq_operations igmp6_mcf_seq_ops = { + .start = igmp6_mcf_seq_start, + .next = igmp6_mcf_seq_next, + .stop = igmp6_mcf_seq_stop, + .show = igmp6_mcf_seq_show, +}; + +static int __net_init igmp6_proc_init(struct net *net) +{ + int err; + + err = -ENOMEM; + if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops, + sizeof(struct igmp6_mc_iter_state))) + goto out; + if (!proc_create_net("mcfilter6", 0444, net->proc_net, + &igmp6_mcf_seq_ops, + sizeof(struct igmp6_mcf_iter_state))) + goto out_proc_net_igmp6; + + err = 0; +out: + return err; + +out_proc_net_igmp6: + remove_proc_entry("igmp6", net->proc_net); + goto out; +} + +static void __net_exit igmp6_proc_exit(struct net *net) +{ + remove_proc_entry("mcfilter6", net->proc_net); + remove_proc_entry("igmp6", net->proc_net); +} +#else +static inline int igmp6_proc_init(struct net *net) +{ + return 0; +} +static inline void igmp6_proc_exit(struct net *net) +{ +} +#endif + +static int __net_init igmp6_net_init(struct net *net) +{ + int err; + + err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6, + SOCK_RAW, IPPROTO_ICMPV6, net); + if (err < 0) { + pr_err("Failed to initialize the IGMP6 control socket (err %d)\n", + err); + goto out; + } + + inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1; + + err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6, + SOCK_RAW, IPPROTO_ICMPV6, net); + if (err < 0) { + pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n", + err); + goto out_sock_create; + } + + err = igmp6_proc_init(net); + if (err) + goto out_sock_create_autojoin; + + return 0; + +out_sock_create_autojoin: + inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); +out_sock_create: + inet_ctl_sock_destroy(net->ipv6.igmp_sk); +out: + return err; +} + +static void __net_exit igmp6_net_exit(struct net *net) +{ + inet_ctl_sock_destroy(net->ipv6.igmp_sk); + inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk); + igmp6_proc_exit(net); +} + +static struct pernet_operations igmp6_net_ops = { + .init = igmp6_net_init, + .exit = igmp6_net_exit, +}; + +int __init igmp6_init(void) +{ + return register_pernet_subsys(&igmp6_net_ops); +} + +int __init igmp6_late_init(void) +{ + return register_netdevice_notifier(&igmp6_netdev_notifier); +} + +void igmp6_cleanup(void) +{ + unregister_pernet_subsys(&igmp6_net_ops); +} + +void igmp6_late_cleanup(void) +{ + unregister_netdevice_notifier(&igmp6_netdev_notifier); +} |